Improvement in fire-tube steam-boilers



J. COW'HIG. Pire-Tubek Steam-Boiler.

Patente-d Feb. 18, 1879.

UNITED STATES 'PATENT Carro-n l JERRY OOWHIG, OF RICHMOND, INDIANA.

IMPROVEMENT IN FIRE-TUBE STEAM-BOILERS.

Specification forming part of Letters'Patent No. 212,301, dated February 18, 1879; application filed November 29, 1878.

To all whom it may concern:

Be it known that I, JERRY Oownrc, of Richmond, l/Vayne county, Indiana, have invented a new and useful Improvement in Fire- Tube Steam-Boilers, of which the following lis a speciication, reference being had tothe accompanying drawings, in which- Figure 1 represents a vertical sectional view of my improved boiler 5 Fig. 2, a vertical sectional diagram, showing a modiiication in construction; Fig. 3, a plan section of the boiler at the line a' x,- Fig. 4, a plan section at the line y y.

My invention relates to vertical return-flue boilers, and is designed to afford a more perfect utilization of the heat, economize the cost of construction and repairs, facilitate the cleaning of the lues, and to aord means of regulating and changing the draft.

To this end it consists in such a construction ot' the boiler and arrangement of its lues and a combustionchamber, in combination with a damper adapted to cha-nge the course of the draft, as to effect these results.

I construct the boiler A with a central rebox, B, and a combustion-chamber, C, connected by a flue or tlues, a. The combustionchamber C is preferably conical in section, located partly below the water-line Z Z, and open at its topfinto the smoke-arch E.

From the bottom ot' the combustion-chamber C, near the side walls, diving-nues b extend downward and outward to the bottom of the boiler, and to an annular space, D, formed by the outer shell of the boiler and the wall of the rebox B, beneath the water-leg. From the same annular space rise vertical flues e within the boiler to the smoke-arch E above.

The combustion-chan1ber C,bcin g contracted toward the top, affords a larger'steam-space in the boiler above the water-line, and, being open at the top, permits easy access to the inclined i'lues I), which may be cleaned by a long-handled brush passed through the opening fof the combustion-chamber. In this opening is placed a butterily-valve or register, which, when opened, permits the products of combustion toescape freely into the smoke-arch E,

but when closed compels them to descend through the ilues b into the annular space D, below, where they enter and ascend through the lues c, and escape.

In operation, and when the fire is started,

the damper or valve F is opened, thus allowing a free draft into the ue; but when the re is well under way the valve F is closed, and the products of combustion compelled to pass through the lues b and c, as stated.

The bottom ot' the combustion-chamber C and the joints of the iiues a and b therewith being below the water-line, they are securely protected against the eects otl heat and the joints ot' ilues cwith the top of the boiler, being at the extreme limit of travel ot' the products ot' combustion through the boiler, are likewise secure from injury from overheating.

Having fully described my invention, I clai1n y l. The combination, in a vertical steamboiler, of' iire-box B, open combustion-chainber C, valve F, connected with said combustion-chamber and controlling its said opening, ascending flues a and descending ilues b, both entering the bottom of said chamber, and ascending tlues c, all arranged and operating substantially as specified.

2. The conical combustion-chamber C, situated partly bencath the water-line and opening through the top ofthe boiler, in combination with ascending tlues a, outwardly-inclined descendingilues b, and valve F, controlling the upper opening of said combustion-chamber, substantially as and for the purpose spcciiied.

3. The col'istruction and arrangement, in. a vertical steam-boiler, of open conical combustion-chamber C, ascending iiues a, and outwardly-inclined descending ilues I), said ilues entering the bottom of the combustion-cham- M ber on a line with its upper opening, substantially as and for the purpose specified.

In witness whereof I have hereunto set my hand this 19th day of November, 1878.

JERRY COWHIG. Witnesses:

L. M. HosEA, E. A. ELLswoR'rH. 

